How much grass to cut?
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Are you asking how short/long to cut your lawn? ^^^^^^^^^^^^^^^^^^^^^^^^^^
Boy am i dumb. I just re-read your post and realise you mean removing the grass to build the bed. OK. I'll try again.
If you've marked out the circle, and as you'll be doing it on grass, a marker paint will work good at the end of the string, Mow the area inside the circle really short. I mean scalp it. Then water it well. Are you going to build a border, like with stones or something?? Anyway, put down a sprinkle of pelletised chicken manure. About a handful to the square yard. Put down over this a 10 pages thick layer of newspaper, don't leave any gaps. This will kill the grass, then cover it all with good quality organic soil/ compost. About 4- 6 inches deep. Then mulch over the lot with a mulch such as spoiled meadow hay, sheep poo or similar. Make it six inches thick. Now, you've got the bed, but it still aint quite ready. The soil below the newspaper is going to start to boil with new life. It'll feed on the decaying grass and the chook poo will feed the cycle. You'll end up with a deeper, richer soil and you won't need to dig it over even at planting time. Just make a hole where you want the
plant to go and turn it over. The earthworms will do the rest of the digging for you.
For an excellent soil breaker, buy some
seed potatoes and place them on top of the newspaper before burying them in the compost. They'll help to condition the soil and you get a crop of spuds as a bonus. It'll be late
spring by the time this bed is ready to
plant with annuals or perrenials but when you do it's gonna be a cracker.
If you aren't planning on a stone border, between mowing the grass and laying the newspaper, go around the circle cutting a V shaped trench with a sharp spade about 3 inches deep to define the edge of the garden. That'll make it tidy and prevent the grass from
growing into it. Hope this is what you're looking for.
Longy
?